md_shellescape() sets SIGINT and SIGQUIT to be ignored, storing the
previous handlers, and restores them after the shell exits. But it
mixed up the two handlers.
Since the signals were usually handled by the same function, this fix
doesn't have much effect, but anything that makes signal code less
confusing is a good thing.
Keypad 5 is now equivalent to the '.' key.
XRogue does not include md_readchar() and its ability to work around
deficiencies in the terminfo entry. So the key will not be recognized
in screen/tmux or anywhere else without the kb2 capability. Adding
md_readchar() would be more complex than it was for Super-Rogue, since
XRogue already does KEY_* interpretation in command().
